And in Shasta County, the range of rewards on the table to solve the area's most notorious crimes pretty much proves it.

That's because Secret Witness of Shasta County's $20,000 reward to find the person who poisoned a Redding officer’s retired police dog is double the amount the organization is offering for any local murders — as well as the high-profile disappearances of Sherri Papini and baby Ember Graham, though some crimes have their own donation pools independent of the organization.

In fact, the hefty sum to catch canine Tarro’s assailant outdoes Secret Witness's rewards in all but the case of 16-year-old Tera Smith, whose suspicious disappearance has haunted local authorities for almost 20 years now. Smith's vanishing has up to a $20,000 reward from the organization for viable tips as well.

Tarro's reward is also higher than the initial $15,000 Texas authorities offered to figure out who's been killing people with package bombs in Austin this month, though that reward has grown to $65,000. Other cities have only $10,000 rewards for high-profile murders and even double-murders.

What's behind the robust offer in Tarro's case?

Sharon Lassiter, president of Secret Witness of Shasta County, said a single anonymous donor came forward with a large gift specifically dedicated to finding Tarro's tormentor.

“There are a lot of dog lovers out there,” she said.

Tarro is expected to recover from the suspected poisoning, which officers believe happened when someone broke into his owner’s house March 7 and stole his guns. The reward is for both burglary and animal-cruelty charges.

His owner — a current Redding police officer — noticed Tarro was acting strangely after he discovered the burglary that afternoon, officials said.

Secret Witness typically caps the rewards tied to crimes at $10,000 of its pooled donation money, Lassiter said. But when someone wants to donate to a specific crime's reward, Secret Witness’s board votes on whether to add that sum to the fixed amount they already would have offered.

“We would have not put it that high if there had not been a personal funds involved," she said.

In Papini's case, for example, Lassiter said the board voted not to add donations to the $10,000 already on the table because, at the time they voted, the reward was tied to finding Papini specifically, not a suspect in her disappearance. Secret Witness generally focuses on catching suspects, Lassiter said, not missing people.

There also was a separate $50,000 an anonymous donor offered directly to Papini's alleged captors, not through Secret Witness, as well as the separate donation-driven reward that the organization voted against adding.

These are all the unsolved crimes in Shasta County that currently have $10,000 rewards, the highest amount after Tarro’s:

The alleged November 2016 abduction of Papini, who resurfaced about a month later.

The 2013 murder of 2-year-old Scarlett Peterson, which authorities consider a child-abuse case.

The homicide of 64-year-old Rick Forbes, a truck driver found dead in his rig at the TA Redding Travel Center in August 2016.

The murder of 67-year-old Edwin Phillips, a business owner found shot at his Bechelli Lane auto shop just five days after Forbes was found dead.

The suspected homicide of Brandon Duvall, who went missing after an incident involving gunshots in June 2015, officials said.

The homicide of Charles Boyt, found dead in the Whitmore woods that same month.

The disappearance of 6-month-old Ember Graham, who went missing in July 2015 and hasn’t been seen since. Her father, Matthew Graham, was a person of interest in the case, and was shot and killed by law enforcement officers in Siskiyou County.

The hit-and-run death of 53-year-old Jon Muncy in November 2010.

The November 2007 death of Christina Stevens, whose body was found in a burnt house that authorities believe someone set on fire to cover up her killing.

The death of Walter James, found dead in a Bella Vista trailer in August 2007.

The Round Mountain shooting death of Jon Ford in March 2007.

The 1984 Burney murder of Terry Arndt and the murder of Frank McAlister, whose body was discovered in Shingletown in 1994 after his car turned up in a Redding parking lot the year before.

Deaths with smaller rewards include:

The suspicious disappearance of 23-year-old Cort Jones-Botta, who vanished in August 2012. That case has up to a $9,000 reward.

The murder of 15-year-old Teri Ray, found dead in Clear Creek in July 1976. There's $5,000 on the table for information that leads to her killer.

$5,000 in the death of Cody Templeton, found lying in a roadway under suspicious circumstances in May 2012.

Another $5,000 in the suspicious disappearance of Heather Cameron, who hasn’t been heard from since a frantic August 2012 phone call saying she’d been drugged.

People with tips on any of these cases are asked to call Secret Witness’s tip line at 530-243-2319, or go to scsecretwitness.com.